Vehicle suspension stabilizer spring automatically operable as supplementary spring



y 1961 J. DAUBEN ETAL 2,983,521

VEHICLE SUSPENSION STABILIZER SPRING AUTOMATICALLY OPERABLE AS SUPPLEMENTARY SPRING 2 Sheets-Sheet 1 Filed May 18, 1954 INVENTORS JOSEPH DAQBEN JOSEF MULLER J. DAUBEN ETAL 2,983 TABILIZER SPRING AUTOMATICALLY May 9, 1961 VEHICLE SUSPENSION S OPERABLE AS SUPPLEMENTARY SPRING 2 Sheets-Sheet 2 Filed May 18, 1954 INVENTORS. JOSEPH DA/BEN JOSEF MULLER I\ A I A A S a s t nt 07 A f2,9ss,521' p w VEHICLE SUSPENSION STABILIZER, SPRING U- TOMATICALLY OPERABLE AS SUPPLEMEN- TARY SP ING,

Joseph Daube'n andJos'ef' Miiller, Stuttgart, Germany;

' assignors to Daimler Benz Aktiengesellschaft, Stuttgart-Unterturklieim, Germany Fi led May 18, 1954, Ser. 430,502

. zsclaims. (Cl. 280- 124) Our invention relates to a vehicle and; more paIticu larly, to an improved arrangement of the springs thereof.

As is well known, the operationof the :springs of a motor vehicle will not be satisfactory to the same degree at all loads. Where. the springs. are properly dimensioned for a full load of the vehicle, they will not be sut iiciently soft when the vehicle carries but a light load. Inversely, springs dimensioned to act in a satisfactory manner when the vehiclecarries a light load, are liable,

' when operated witha full load, to be unduly flexed beyond the permissible limit. I Anideal springing will require that the spring characteristic is variable depending on the load of the vehicleat any time: Since such a continuously Variable characteristic cannot be obtained by practical means, recourse has been taken frequently to the provi& sion of invariable main springs dimensioned to function properly for a load range extending from the minimum load to a median load, andof additional springs adapted to be rendered. eflEeotive when the load approaches its maximum. Ithas been proposed to mount suchadditional springs. in such a manner that they will bear on the axle after the main springs have been flexed to a certain degree.- This arrangement involves the disadvantage, how ever, that under full load 'operating conditions the distance'through which the wheels move up and down rela tive tothe body of the vehicle is considerably reduced,

theupper .portionof such distance being eliminated,and

that the road clearance difiers with diiferent loads,

It is an object of thepresent invention to provide an improvedspring arrangement in which such disadvantages are avoided,.-the body. of the vehicle, when under full load, being lifted to ,a normal road clearance by the actuation of means-rendering. an additional spring efiective.

, Further objects ofthe invention are to provide an ac.-'

mating-mechanismtor-that purpose which does not re? quireipowerfrom thefengine or the battery or -manual power, but is supplied the required energy from the up-a'nd-downmovement of one of the wheels, and to Patented May 9,1961

pends which is suitably connected to the extension 16,

rubber cushions being interposed therebetween. A pair of tubular half axles 18 and.19 extends from the housing 17 outwardly, each of such half axles being provided with opposite trunnions journalled in a bracket 20 fixed to the housing 17, the axle being thus mounted for pivotal motion about an axis extending fore and aft. In this manner, the half axles18 and 19 are capable of independent oscillation within, a. vertical transverse plane of the vehicle. In each of the tubular half axles 18, 19a shafit is journalled which is geared by a suitable difierential gearing with -a main drive shaft 21 which connects the transmission in housing 17 with the engine not shown. The rear wheelsof the Vehicleare fixed on the ends of the. shafts jonrn'alledjin the tubular half axles 18 and 19. Each Wheel comprises a brake drum'22 and the customary wheel disk. and tire attached thereto by bolts23. In orderto relieve the brackets 20 and the trunnions journalleditherein from the horizontal thrust, links 24 and 25 extend from the outer ends of the tubular half axles 18 and 19 forwardly. The front ends of such links are provided with e'yesjournalled on. studs 26 and 27 projecting from the beams 10 and 11. The rear ends of the links 24 and 25 are. suitably connected to the half axles 18 and 19 by means not shown in detail. Rearwardly upwardly as to provide the required clearance between .the'body and the'axles 18 and 19 Upright helical springs 28 and 29 are inserted between the links 24, 25 and the ends of the transverse member 15 projecting outwardlyffromfthe beams 10 and 11.. The springs 28 and 29 are sodimensioned as to be capable of lifting the body ll), ll-tlie required clearanceabove the axles 18 and 19, provided that/the load carried by'the vehicle does not exceed amedianmagnitude.

Inorder toreduce outward inclination of the vehicle body when the same is driven through curves, a stabilizer springis provided which is flexed by difierential .upeanddown motion of the wheels" 22; 4 In, the embodiment shown, such stabilizers'pringis formed by ators'ional rod .30 extending parallel to the. transvers e niember 14 torsiontransmitting meansa're'formedby rearwardly exprovide an additional spring hayingthe-dual function of v an additional rspring aiding the main springs under full load conditions and of a stabilizer spring responsive to Further objects of our invention will appear from the description of a preferred embodiment of our invention illustrated in, the accompanying drawings. However, it is to be. understood that. such detailed fdescription's'erves that .of limitation thereof. In the drawings,

Fig. 1 is a perspective view of the rear portion of the l e mot veh cle, the wheel disks and ares eing I omitted and i Fig a efticalfsection tlirough a pump supplying a p ssure for thespring actuating mechanism,

.55 differential up-and-down movements of opposite wheels. 7

a I so the purpose of,illustr ation ofthe invention rather than tional spring provided r v 29, which are individual and being journalle'd in brackets 31 attached thereto.

ends of thetspring rod 30 are provided iwith tor'sioh transmitting meansfor connection with the';vvheelguidingmembers 2.4 and 25. In theembodimerit shown,.such

tending parallel arms 32 :Whichinay bejnteg'ral W iththe spring rod 30 .and have outwardly benn end's 33' each engaging a rubber bushing inserted; a h"rizontal transwe here of the'wh eel-guid rigrnern orlink 24,'or. 25 respectively. Between itsendssthels ng rod ,30 is pro vided with a transverse extension." In "the}embo'dir'nent .34 which constitutes such extension.

The torsional spring r shown,'the-rod 30 is bent be'tw en'its ends tofo' rm a loop V I 0 constitutes {a singlei'addiion to the; springs 28and 3 its ends and carrying 'a pair of stops stops are adapted to engage the extension 34 of the torsional spring rod 30 on opposite sides thereof. While the stop 36 is fixed to the bracket 35, the other stop 37 is'rnovable towards and away from the stop 36; To this end, stop 37 is carried by a plunger 41 projecting from a horizontal cylinder 38 whichis fixed to the bracket 35. A helical spring 39 which isextended between a hook fixed to plunger 41 and anear projecting from cylinder 38 tends to pull plunger 41 forwardly away from the fixed stop 36. The forward'endof cylinder 38 is connected by a conduit 40 to a pump P.

36 aid 37 The increase the spring coefficient when the wheels move up- 28 and 29 under full load conditions, irrespective of the 1 When fluid under pressure is fed by pump P through I conduit 40 to the hydraulic ram constituted by cylinder 38 and plunger 41 the latter is urged rearwardly and will cause stop 37' to engage the extension 34 pressing the same against thefixed stop 36. When the conduit 40 is relieved from fluid pressure, however, the spring 39 will pull plunger 41 forwardly thereby opening the clamp or vise and rendering the clamp ineffective.

' When the settable clamp is ineffective, thus permitting the additional spring 30' to freely turn relative to the body in its bearings 31', the spring does not assist the springs 28 and 29 in supporting the body on the wheels 22 and is not flexed by synchronous up-and-down movements of the wheels 22 relative to the body. This is true provided that the up-and-down movements of the wheels remain within normal limits. When the vehicle is driven through a curve, however, causing the body of the vehicle to incline outwardly under the effect of the centrifugal force, one of the wheels 22 will move upwardly, while the other wheel will move downwardly with respect to the body. In response to such differential up-and-down mo- 'tion of the'wheels the additional'spring 30 is flexed and will thereby counteract and reduce such lateral inclination of the body. In this manner, the additional spring 30 will act as a stabilizer spring as long as it is free to turn bodily within its bearings 31. An additional stabilizer spring coordinated to the front wheels'of the vehicle may be dispensed with because itdoes not make any difference regarding the lateral inclination of the body whether the stabilizer spring acts onthefrOnt wheels or on the rear wheels.

The lateral extension 34 cooperatlng with thestops 36 a and 37 enables the additional spring 30 to perform another additional function. When both wheels 22 move up' and down synchronously through equal distances, the extension 34 of the spring rod'30 will engage the stops 36 and .37, downward motionof the wheels bringing extension 34 to engagement with fixed stop 36, and upward motion of'the wheels causing extension 34 to engage the settable stop 37.

i As will be described later, the pump P will remain ineffective leaving stop 37 in its retracted forward position when the loadcarried by the vehicle does not exceed a median limit. In'this position, the stop 37 is so far spaced from the normal'position of extension 34 that engagementwill not-'occur unless the wheels 22 move upwardly a considerable distance thereby flexing springs 28 and 29' an amount approaching the permissible limit. Upon engagement with the stop 37 the additional spring 30 will be flexed by continued-upward movement of the wheels 'and will thus succorjand' assist the springs 28 and 29 individually coordinated to the wheels in supporting the body. inversely, excessive downward movement of the wheels and consequent .relief 'of springs 28 and 29 distance through which the wheels 22 move, upwardly or downwardly. To this end, the clamp or vise 36, 37 is "closed by admission'of fluid under pressure to the cylinder 38, whereby the stop 37 is moved rearwardly clamping the extension 12 of the torsional spring rod against stop 36. When the clamp is thusclosed, the spring rod 30 is permanently effective to .cooperate' with the individual springs 28 and 29 in supporting the body on the wheels.

Let us assumethat thetwo individual springs 28 and 29 'be so dimensioned. asto ,producethe'desirable springing effect with two passengers seated on the front seats, the springs 28 and 29 ensuring the proper normal clearancebetween the halfaxles 18, 19 and the chassis frame 10 to 15 and ensuring soft riding qualities. Then, when the vehicle is loaded with four to five passengers plus baggage, the pump P will functionas explained hereinafter to close the clamp restraining movement of the extension 34 of the additional spring 30 relative to the body. As a result, the spring 30 is so biased as to relieve the individual springs 28 and '29 to a certain extent thusrestoring the normal clearance between the half axles '18, 19 and the chassis frame and restoring the soft riding quali ties of the springs. Therefore, the wheels 22 are able to move through the same distance up and down relative to the chassis as they were withthe smaller load of two passengers without baggage and with-stop'37 retracted to ineffective position by spring 39 as shown.

The pump P constitutes a fluid-operable actuating mechanism which is coordinated to the settable means '37,

'41 and adapted to adjust the same to effective position and is mounted for operation by up 'and-do'wn motion of one of the wheels. The pump P comprises-a cylinder body'42 and a plunger 43. One of these two elements, preferably the cylinder body 42, is attached to the'vehicle body by bolts 48, for instance to the longitudinal beam-11 thereof, while the other of the two elements, preferably the plunger 43, is connected to one of the wheels 22 for actuation by up-and-down movement thereof; In the embodiment shown, the plunger 43 is connected to the wheel 22 through the intermediary of a connecting rod, the arm 32-and the link 24, the connecting rod 44 having its upper end connected by a pin 45 to thelower end. of

' plunger 43 and having its lower end-connected by'a pin 46 to a bracket 47 fixed on the arm 32 of the spring 30. Therefore, relative *up-and-down movement of one of the wheels 22 results in a reduced corresponding up-anddown movement of plunger 43'in-the cylinder-body 42i The reduction of the movement is desirable in'orde'r to upon the additional spring 30 will function to counteract continued downwardmovement of the wheels. ."Hence, it will appear'that the'torsional spring 'rod30 will v.actra sfan additional: spring assisting the individual springs 28 and12 9 .whenitheload imposed on the vehicle amounts to a degree considerably less than the permissible I reduce the dimensions of the pump. l s y The cylinder body 42 -is provided Witha-verticahbore 49 which slidingly accommodates the plunger 43 and has a pressure port 50 near its top, a-suctionport 51 located at a considerable distance therebelow, and a bypass duct 5-2 intermediateports 50 and 51." The duct 52 communicates through a bore 53 with the-conduit 40 which is held by anipple 54 incommunication'withthe pressure port 50,'a:'pressure 'spring;55"and a ball 56 constituting a check ;valve being interposed; such check valve normally closing the discharge 'port 501 Without interfering with the communication be ween the bypass duct52and the conduit 40." w i I The suction port 51 communi ate's with anoiltank 57. through a pipe 58. A relief valve 59 constituted by a ball. is normally pressed by a spring 60 against the lower end of bore 5 3, the counter bore'fil accommodatmax mumvload he ad t qna r r 30nha 's c an t sashara tsri t s as imma eria the suction port51 by a bore 62f m the spring 60 andv the ball 59 comrduriicating' with m s; j Pr wi a i ifi 6 nd b t en- 91 5 i t az?.s tisalfthern atedd m! Pass n fluctuations. When the inventi I E providing for a clearance 65 between the plunger 43 and the wall of bore 49. This clearance communicates with the bore 63 by a transverse bore 66. The top'of plunger 43 is provided with a check valve 6'7 adapted to close bore 63, such check .valvebeing formed by a disk'held in place by a split ring withina recess provided in the top of plunger 43. A groove 69 extends upwardly from port 51.,

The pump P functions as follo wsz When the plunger43 is in its. uppermost position, the clearance '65 will register with the, groove 69. When the plunger 43 descends, it will, therefore, suck oil into the space '70 at the top of bore 49 from tank 57 through pipe .58, suction port 51, clearance 65,. groove 69, transversevbore 66, and bore 63.past check valve 67. Let it be assumed'that the vehicleis heavily loaded and is started with. the clamp 36, 37-still' being open. The main springs 28, 29 are compressed to such an. extentthat link '24 will keepplunger .43 half way'between its uppermost position and the position shown. The distance through which the wheelsw22 may move upland down relative to the body is thus limited to less than half its normal :magnitude. Whenv the vehicle starts to move,

the unevenness of the'road forces the wheels 22 up and down. The consequent reciprocation of plunger 43 is limited to the upperportion of its stroke in whichthe plunger covers the bypass duct 52. Therefore, "the oil sucked into space 70 is fedpast check valve 56'into' the conduit-40 thereby imparting 'a stepwise movement to stop-37 intermittently closing the clamp 36, 37, {whereby the additional spring 30 is rendered eifective to reinforce the main springs 28 and 29. and to lift the body so as to restore the normal clearance between the body and the half axles 18 and 19. .Excessive liquid fed intofcom duit' 40 after plunger 43 has reached its rearmost position will be'discharged pastcheck valve 59 through bore 62.,:p0rt'5"1,'and pipe-58-into the tank 57. i As soon as the 'body has been lifted to such an extent that -the z-reciprocating plunger 43 will intermittently un: cover the groove 69, the fluid under pressure'in conduit 40 :is permitted to, return through bore 53,?bypass, duct 52,3cylinder bore 49, groove 69, suction port 51,3 1111 pipe 58 to the tanker The groove 69 has-sucha-nar-row,

crosssection that such return place :gradually. Hence, it will appear that when, the body vof the vehicle has been lifted -by-the reinforcing eifect ofspring 30 to such "an extentthat the -plunger 43 're'ciprocates Within the-jlo'wer -sectionof'itsstroke in which it uncovers the groove 69 frequently, the ,pressurerproduced conduit 40 will just su'fiiceto keep the clampclosedi 'Whenthe vehicle carries a smallload, the plungeri43: I,

reciprocates from the start ofv the vehicle :the lower'sectionof-its' stroke in which it uncovers the gnqove 69'and:fWill produce no pressurein conduit 40 -leavi ng 5 stop 37-iin;'i'ts"iriefiective position. -Thus, the groove 69 constitutes a means rendering the pump, unable duc'e'pressurewhenever downwardfmotion of;;th 22* relative to; the body exceeds a predetermined h Therefore; the. spring 30will-act as a stabiliger spring only and willgnotreinforce thesprings 28 land; 29 -When the plunger 43- reciprocates primarily I V 'upperportionlofits stroke, it will feed fluid uncle p sure, even-though ,occasionally,-the groove 69 mayfbe;

uncovered-bythe plunger coincidentally ,to' a eonsid able expansion of.spring-'-28. By suitahly. choosing the a location of ,thei'transverse bore 52 andyof the groov. the position of thewheeLpthich the clanip 36 renderedcefiective may; be selected as, desir d; ably dimensioning ,-the}eross the clamp. may

ti le n us imposed on t ubject to in sees-52a vehicles equipped with a motor in'their rear 'endsf'tt prefer to apply our invention to the rear wheelsand 'to the front wheels.

, bodily movement of spring 30 with respect to the body operation. function'of acting as a stabilizer'spring and as an, additional spring reinforcing the main springs.

of the vehicle will not be restrained by the stops 36, 37. Yet the spring will function by engagement with stop 37 to prevent the springs 28 and 29 from being-compressed to the uttermost limit and to cushion a conse quent shock. The normal average clearance between the wheel axles and the frame is automatically maintained by the actuating mechanism P, irrespective of the load. Hence, a full load is not liable to press down the body excessively, nor will, the springs lift the body unduly when the load is smalL, Also, the power supplied to the actuating mechanism need not be supplied by the engine or the battery of the car or by manual operation. Nevertheless, our, improved springing arrangementrequires a minimum of parts and is simple and reliable in The additional} spring 30 serves the dual While we have described our invention with r eference to [a preferred vembodiment thereof, we wish it to -be clearlyunderstood'that the same is not limited tothe details thereof, butis'capable'of numerous'modificatio'ns within the scope or the appended claims. Whatwe claim is;

1. Ina vehicle, "the combination comprising a body, a pair of wheels, members for guiding said wheels relative tosaid'hody, independently. of each other, sprin'g's individually coordinated to said wheels and mounted on said mernbers' andf'saidlbody to restrain said relativ'e motion, ;a torsional stabilizer 'springr'od'mounted on said body, transverselythereof, torsion-transmitting on the ends of saidspring rod for connection with said members, causing said spring rod' to be flexed by .dif ferential 'up-and-do'wn motion of said wheels, saidspring rod. being provided between its ends with a transverse extension, settable means coordinated to said spring rod and to said body, said settable means being settable vto an effective position and anjinetfective'position adapted, when in said efie'ctive'pos'ition, toe'ngafgefsaid extension and to thereby restrain movement of said extension relative to' said body in response to synchronous up-and-downinotion of said wheels, and actuating means operatedby up-and-dowri movementv of at least one 'ot said wheels jfor automatically setting said settable means from. one of positions tothe other,

2,111 a nue, are 'combin'ationjset forth in 1';

, in which said spring r'od is bent to forrna floop between its ends',f-such loopcor'i'stituting said transverse extensieni 3 -I n. ,,veliiclejthe combinationcomprising a body, a

pai'rk'of wheel's,'springs supporting snafpmy a wheels, at torsional "stabilizer spring rod journalled; on

saidbo'dy "to extend rtransverse'ly thereof,- torsion-trans meansa'ttheends-of said spring rod connected directly by up-and-down motion of one of said wheels,

and, a;c ond uit connecting said pump to said ram.

4. In a vehicle, the combination comprising a body, a pair of ,wheels, springs supporting said body on said wheels a torsional stabilizer spring rod journalled on said. body to extend transversely thereof, torsion-transmitting -means at the ends of said spring rod connected with, said wheelsfor operation thereby causing said spring rod to be flexed by difierential up-and-down motion-of said wheels, said spring rod being provided between its ends with a transverse extension, a first stop fixed'to saidbody, a second movable stop mounted on said body for movement-towards and away from said firststop,

,said extension being positioned between said stops, a

fluid-operable ram mounted on said body for. automatically moving said second stop, a pump directly operated by up-and-down motion of at least one of said wheels, and aconduit, connecting said pump to said ram. 5. Ina vehicle, the combination comprising a body, a. pair of wheels, sp'rings supporting said body on said wheels, a stabilizer spring movably mounted on said body, means connected with said stabilizer spring and said wheels and adapted to flex said stabilizer springin response to differential up-and-down motion of said wheels, fluid-operable means mounted on saidbody for engagernentwith said stabilizer spring and adapted to restrain movement of the same relative to said body, a pump driven directly by"up-anddown motion of one of said wheels, and a conduit connecting said pump to 'saidfluidoperable means,said pump having asuction'port and ap're ssure port and a bypass conduit connecting said ports and being provided with movable means controlling said bypass and opening thesame whenever downward motion of said last-mentioned wheel exceeds a predetermined limit.

. 6.,In a vehicle, the combination set forth in claim 5, in which said pump comprises a pump cylindermounted on said body, and a plunger movable in said cylinder and connectedto one of said wheels, said movable means controlling said bypass being constituted by said plunger. 7. In a vehicle, the'combination comprising a body, a pair of wheels, pivotal members for guiding said wheels relative to said body, helical springs for supporting said body on said members, a transverse stabilizer spring journalled on' said body and having arms at its ends connected to said members and adapted to flex said stabilizer spring in response to differential movements ofv said wheels rela tive to said body, a lateral extension being provided on said stabilizer spring intermediate its ends, aclamp mounted on said body and straddling said extension, a hydraulic ram adapted to close saidiclamp on said ex tension,,'a,pump mounted on said body and having a plunger connected to oneof said. members for actuation thereby, aconduit'connecting said pump to said hydraulic ram, said pump b'eing'provided a suction port, with a pressure port and with a'bypass duct connecting said ports, said duct'being adapted to be controlled by said plungerand to be opened by the same whenever down; ward'motion of the last-mentioned one of said members relative to said bodyexceeds' apredetermined limit.

8. In a vehicle, the combination'set forth in claim v 7, in which said pump includes said plunger and a cylinder body-provided with a borewhicli slidingly accommodates said plunger andis provided with said pressuieport, said suction port and said bypass ductintermediate said ports; said duct communicating with-said conduit and being adapted to communicate through said bore with saidsuction port when thelatter is uncovered by said plunger.

9. .In a vehicle, the combination comprising a body, wheels, springs for supporting said body on said'vv li'eels',

a' spring-adjusting mechanism coordinated to. at least. one

of said springs, fluidoperable means connected with said.

mechanism for actuation thereof, .a reciprocated' by upiand-rsl wn ma ng-pt 1 c isa whr l s having a suction port, a-pressure port and a bypass duct sure port-'tosaid fluid-operable means, and movable means controlled by said last-mentioned wheel and adapted to control said bypass duct and toopen the same whenever downward motion of said wheels exceeds a predetermined limit;

10. In a vehicle, the combination set forth in claim 9, in which said pumpincludes a plunger and a cylinder body, the latter being provided with a bore which slidingly accommodates said plunger and is provided with said pressure port, said suction port and said bypass duct intermediate said ports, said movable means adaptedto control said bypass duct being constituted bysaid plunger.

11. In a vehicle, the combination comprisingja body, a pair of wheels, members for guiding said wheels relative to said body, springs individually coordinated to said wheels and mounted on said members and said body to restrain said relative motion, a single additional spring movably mounted on said body and connected to both of said members, settable means, coordinated to said additional spring and to said body, said last mentioned means being automatically settable to an efiective position and to an inefiective position and operative in said eifective posi- 'tional to restrain movement of said additional spring relative to'said body, and'actuating means for actuating said settable means 'from one of said positions to the other, said actuating means producing operating energy for said settable means by up-and-down movement of one of said wheels and including means for disabling said actuating means upon downward movement of said one wheel" in excess of a predetermined limit. V

12. In a vehicl'e with a frame, wheels, and guide means on eachside of said vehicle between said frame and said wheels,'the combination of a spring system for individual- 1y spring suspending said wheels on said frame comprising springs individually coordinated to said wheels, additional spring means in said system common to both sides of said vehicle, adjusting means common to both sides of said vehicle including actuatingmeans for changing the eifcctiveness of said additional spring means, said actuating means being operative for automatically controlling said adjusting means in response to the load onsaidwheels and actuated by the up-and-down movement of at least one of said wheels to tliereby maintain the distance between said frame and said wheels substantially constant.

1 3. In a vehicle, the combination comprising a superstructure, a pair of wheels, a pair o f'ha-li axles supporting said wheels, means for pivotally connecting said half axles tosaid superstructure allowing said half axles to swing with respect to said superstructure in an up and down movement independently of each other, springsiindividually coordinated to said wheels and mounted be,- tween saidhalf axles and said superstructure to restrain the motion of said wheels relativejtosaid superstructure,

' 7 common torsion bar means for both half axles extending .inovements of'said wheels, stop meansprovided on said Y superstructure essentially at the longitudinabcenten-of said torsion bar means and cooperating with said torsion bar means,-adjusting means including actuating means 10- cated' at a point of said vehicle remote from said stop meansand foradjusting said stop means 'rom 'an-inefiec tiveposition with respect to 'equal's'pringing movements oi said wheels to an effective "position in which the free tur'ning moven ent of saiditofrsion" bar-[means islimited 1 to la" predetermined amountiwithin the: springing -move re t 9; San a's; hair axles, "said actuating means being operative to produce; operating energy fo'r said stop'means bythef up andgdown movementpf at least-'one'lof said es with respecttosaid superstructure. 1

14. In a vehicle, ,the combination set forth in-claim; 13, wherein said common torsion bar means comprisesa-bar having two bent ends operatively connected to said half axles and a U-shaped middle portion ofsaid torsion. bar means cooperating with said adjustable stop means.

15. In a vehicle, the combination comprising a body, a pair of wheels, members for guiding said wheels relative to said body, individual spring. means mounted on saidimembersqfor supporting said body on said wheels for restraining said relative motion, a single additional spring movably mounted on said body and connected to both of said members, adjustable means operatively connectedf'to said additional spring and to said body, said adjustable means being adjustable to an eifectiv'eposition and to an ineffective position and adapted, when, in'said efiective position, to restrain movement of said: additional spring relative to said body, and actuatingmeans for automatically'actuating said adjustable @means from one of said positions to the other, said actuating means being operated by up-and-d'own motion of one of s'aid'wheels and, including means for disabling said actuating means upon downward motion of said one wheel in excess'of a predetermined limit.

. J l l to engage said additional spring on opposite sides thereof, one-oi said .stopsbeing fixedto ,said. body and'the other one of said. stops being movable towards and away from said one stop.-. f 1 l 19. :In a vehicle, thecombination comprising a body, a pair of Wheels, members for guiding s-aid wheels relative to-said body, individual springmeans mounted on said members for supporting. said, body -on said wheels "for restraining said relative motion, a single additional spring 16. In a vehicle, the'combination comprising a body, I

apair of wheels, members forguiding said wheels relative to said body independently of each other, including spring means mounted-on said members for supporting said body on said wheels for restraining said relative motion, an additional spring movably'mounted on said body and'connected to both-of saidmembers for bodily movement relative to said body in response to 'synchronous up-and-down motion of saidwheels and for flexing in response to differential up-and-down motion of said wheels, adjustable means operatively connected to said additional spring and to said body, said adjustable means being adjustable to an eifective position and to an ineffective position and adapted, when in said effective position,

to restrain said synchronous movement, and actuating means for automatically actuatingsaid adjustable means from. one of said positions to the other, said actuatmg means being operated by up-and-down motion of one of a said wheels and including means for disabling said actuating means upon downward motion of said one wheel 1n excess of a predetermined limit.

17. In a vehicle, the combination comprising a body,

a pair of wheels, members for guiding said wheels relative to said body, individual spring means mounted on said members for supporting said body on said wheels movably mounted on. said body and-connected to bothof said members, adjustable means operatively connected to. said additional spring and to-said body, said adjustable means being adjustable to, an effective position Lto'an ineifective position and adapted, when in said efiective position, to restrain movementof said additionalspring relative to said body, and an actuating means for automatically actuating said adjustable means from :one of said positions to. the :other, said actuating means being operative to produce operating energyfor said adjustable means by up-and-down motion of at least one as said wheels and to activate said actuating means.

ln a vehicle, the combination comprising a body, a-pair of wheels, members for guiding said wheels relative-tosaid body, individual spring meansmounted on said members for supporting said body on said wheelslfor restraining said-relative'motion, a single additional spring movably mounted on said body and connected tto both of saidmembcrs, adjustable means operatively connected to said additional spring and to said body, saidadjustable means being adjustable -to an effective position, and to an ineffective position and adapted, when in said eflt'ective position, to restrain movement of said additional spring relative to said body, and an actuating means for automatically-actuating said adjustable means from one of said positions to the other, said actuating means including'a fluid-operable mechanism operatively connected with said adjustable means to adjust the same to said effective position, a pump mounted to be directly driven by up-and- 7 down motion of one of said wheels, and a conduit .connecting said pump and said fluid-operable mechanism.

21. In a vehicle, the combination comprising a body, a pair of wheels, members for guiding said wheels relative tosaid body, individual spring means mounted on said membersior supporting said body on said wheels for restraining said relative motion, a single additional spring movably mounted on said body and connected to both of a said members, adjustable means operatively connected to for restraining said relative motion, a single additional spring movably mounted on said body and connected to both of said members, adjustable means operatively connected to said additional spring and to said body, said adjustablemeans being adjustable to aneifective position and to an inefiective position and adapted, whenin said effective position, to restrain movement of said additional spring relative to .said body, and an actuating means for automatically actuating said adjustable means from one of said positions to the other, said adjustable means comprising a clamp mounted on said body and adapted to engage said additional spring on opposite sides thereof.

18. In a vehicle, the combination comprising a body, a pair of Wheels, members for guiding .said wheels relative to said body, individual spring means mounted: on said said additional springand to said body, said adjustable meansbeing adjustable to an efiecti've position and to an ineffective position and adapted, when in said effective position, to restrain movement of said additional spring relative to said body, and an actuating means for auto- .matically actuating said adjustable means from one of said positions to the other, a fluid-operable actuating mechanism coordinated to said adjustable means to adjust the same to said eflective position,;a pump operated by up'-- and-down motion of at least one of said wheels, and a conduit connecting said pump to said fluid-operable actuating mechanism, said pump being provided with means rendering said. pump inefiectualto produce pressure upon downward motion of said wheel relative to said body in excess of a predeterminedlimit.

members for supporting said body on said wheels for restraining said relative motion, a single additional spring 1 movably mounted on said body and connected to both of said members, adjustable means operatively connected to said additional spring and to said body, said adjustable means'being adjustable to an eifective position and to an inefifective position and adapted, when in said efiective position, to restrain movement of said additional spring relative to said body, and an actuating means for auto matically actuating said adjustablefmeans from one of said positions to the other, said adjustable means com- I prising a pair of stops mounted on said body and adapted.

to said superstructure allowing said. half axles to swing withrespecttosaid superstructure in an up=and-'do,wn- 'movement independently of each other, springs individ-" ually coordinated to said wheels and mounted between said half axles and said superstructure to restrain the'rnoi 22. In a vehicle, the combination comprising'a superstructure, a pair of wheels, a pair of half axlessupporting.

said Wheels, means for pivotally connecting said half axles -tion of said wheels relative to said superstructure, common torsionbar means for both half axles extending transversely to said vehicle fromone side thereof to the" other, means connecting the ends of said -torsionlbar '11 means to said half axles in such arnanner that said torsion bar means is effective only upon unequal springing movements of said wheels and is inefiective upon equal springing movements of said wheels, stop means provided on said superstructure essentially at the longitudinal center ofv said torsion bar means and cooperating with said torsion bar means, adjusting means for said stop means adapted to be adjusted from a point of said vehicle remote from said stop means and for adjusting said stop means from an ineffective position with respect to equal springing movements of said wheels to an effective position in which the free turning movement 'of said torsion bar means is limited to a predetermined amount Within thespninging movement of said two half axles, said common torsion bar means comprising a bar having two bent ends operatively connected to said half axles and a U-shaped middle portion of said torsion bar means cooperating with said adjustable stop means, said stop means comprising two stop elements arranged on both sides of said U-shaped middle portion and alternately cooperating with said middle portion.

23. In a vehicle, the combination comprising a body, at least one pair of wheels disposed on opposite sides of the vehicle, first spring means for individually supporting the wheels to said body, stabilizer spring means operatively connectingflsaid wheels to each other, adjusting means including actuating means for adjusting said stabilizer spring means, said actuating means deriving the operating energy for activating said adjusting means by the up and down motion of one of said wheels with respect to the body, said adjusting means including means adjustable in dependence of the actuation of said actuating means, said last-mentioned means in a first adjusted position being operable within a predetermined range of synchronous springing movement of both wheels to render said stabilizer spring means inefiective against said synchronous movement and allow said synchronous movement without resistance by said stabilizer spring means, said last-mentioned means in said first position admitting said stabilizer spring means eitective as a stabilizer means to, yieldingly resist opposite springing movements of said bothwhee'ls, and said last-mentioned means in a second adjusted position being operable to render said stabilizer spring means efiective to resist said synchronous movement of both wheels within said predetermined range as well as to re.- sist opposite springing movements of said whee1s..

References Cited the :file of this patent UNITED STATES PATENTS 1,291,016 Kellogg Jan. 14, 1919 9 2,490,311, Rostu' .n Dec. 6, 1949 2,577,761 Hickman Dec. 11, 1951 2,592,391 Butterfield Apr. 8, 1952 2,687,311 Nallinger Aug. 24, 1954 2,733,934 Muller Feb. 7, 1956 2,808,270 Muller Oct. 1, 1957 2,840,390 Walker June 24, 1-958 V FOREIGN PATENTS,

' 767,620 France May 7, 1934 Great Britain Oct. 29, 1952 

